MD63B800L - 800Amp Circuit Breaker

MD63B800L - 800Amp Circuit Breaker

When you're replacing a large-frame breaker, small differences in the catalog number can mean meaningful differences in the actual configuration. The MD63B800L is an 800-amp, 3-pole, 600V MD6 molded case circuit breaker with a thermal-magnetic trip unit, and this version includes both line- and load-side lugs. For legacy systems that require this exact MD6 configuration, the MD63B800L can serve as a form, fit, and functional replacement when all electrical, dimensional, and connection requirements match. Solid molded-case construction is built to last when selected, installed, and maintained correctly.

Key Features and Benefits

• 800 Amp, 3-Pole Configuration: Rated at 800A with three poles, providing the core electrical configuration needed when matching an existing MD6 breaker application.
• Thermal-Magnetic Trip Unit: The supplied product information specifically identifies the MD63B800L as a molded case circuit breaker with a thermal-magnetic trip unit.
• 600V Rating: Rated for 600V, with the voltage clearly identified for compatibility checks.
• Line and Load Lugs Included: This model includes TA3K500 lugs on both the line and load sides, an important distinction when identifying the correct MD63B800 configuration.
• Copper or Aluminum Conductors: The supplied lugs accommodate 1/0 AWG–500 KCM CU/AL, giving installers a defined conductor range to verify.
• 40°C Breaker Rating: Identified as a standard 40°C MD-frame breaker.

Technical Specifications

• Catalog Number: MD63B800L
  
• Article Number: US2\:MD63B800L
  
• Product Type: Molded Case Circuit Breaker
  
• Product Family: MD6, 25KAIC, 600VAC
  
• Trip Unit: Thermal-Magnetic
  
• Amperes: 800A
  
• Poles: 3
  
• Voltage Rating: 600V
  
• Interrupting Rating at 600V: 25kAIC
  
• Interrupting Rating at 480V: 50kAIC
  
• Frame: MD
  
• Temperature Rating: Standard 40°C breaker
  
• Breaking Capacity: Standard Breaking Capacity
  
• Line-Side Lugs: Included
  
• Load-Side Lugs: Included
  
• Lug Type: TA3K500
  
• Wire Range: 1/0 AWG–500 KCM
  
• Conductor Compatibility: Copper/Aluminum (CU/AL)
  
• Dimensions (W x H x D): 9 x 16 x 6 in.
  
• Net Weight: 61.619 lb
  
• UPC: 783643011755
  
• Commodity Code: 8536200020
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

The MD63B800L is documented as meeting UL 489 and IEC 60947-2 standards. Because electrical products require careful, accurate specification matching, we include only the documented standards and avoid extending them into certifications or application claims that were not supplied.

Where It Works Best

The MD63B800L 800A circuit breaker is a practical candidate for compatible existing and legacy electrical equipment that specifically requires an MD6/MD-frame, 800 amp, 3-pole thermal magnetic molded case circuit breaker with the corresponding voltage, interrupting ratings, dimensions, and conductor connections.